These are allowed to be completely omitted; does your code cope with that?
```
			<xs:element name="Extension" type="tApplicationServerExtension" minOccurs="0"/>
[..]
			<xs:element name="IncludeRegisterRequest" type="tIncludeRegisterRequest" minOccurs="0" maxOccurs="1"/>
			<xs:element name="IncludeRegisterResponse" type="tIncludeRegisterResponse" minOccurs="0" maxOccurs="1"/>
```